Spider (polarimeter)
= Spider (polarimeter)
{wiki=Spider_(polarimeter)}
SPIDER (Spherical Polarimeter for the Investigation of Dust and Exoplanets’ Reflectance) is an instrument designed to measure the polarization of light, particularly from astronomical objects. This polarimeter is used to study various celestial phenomena, including the light scattered by dust in protoplanetary disks, the atmospheres of exoplanets, and other astrophysical environments.